Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
Ystradgynlais notes an average high-temperature of a chilly 8.3°C (46.9°F) in December, displaying minor variation from November. December nights experience a minor temperature downturn to a wintry 5.2°C (41.4°F).Humidity
January and December, with an average relative humidity of 87%, are the most humid months.Rainfall
The months with the most rainfall are November and December, with an average 66mm (2.6") of precipitation.Snowfall
January through March and December are months with snowfall. December is the first month it typically snows in Ystradgynlais. Throughout December, in the average 1.1 snowfall days, it receives 9mm (0.35") of snow. In Ystradgynlais, during the entire year, snow falls for 5.4 days and aggregates up to 28mm (1.1") of snow.Daylight
The month with the shortest days in Ystradgynlais is December, with an average of 7h and 54min of daylight.On the first day of the month, sunrise is at 8:00 am and sunset at 4:08 pm. On the last day of December, sunrise is at 8:21 am and sunset at 4:14 pm GMT.
Sunshine
The average sunshine in December is 3.8h.UV index
The months with the lowest UV index in Ystradgynlais are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. To guard against the harmful effects of the Sun, minimize exposure during midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Ystradgynlais?
What are the most humid months in Ystradgynlais?
What is the average humidity in December in Ystradgynlais?
What is the wettest month in Ystradgynlais?
How much does it rain in Ystradgynlais in December?
When does it start snowing in Ystradgynlais?
What is the month with the shortest days in Ystradgynlais?
What is the average length of the day in December in Ystradgynlais?
When is the sunrise / sunset in December in Ystradgynlais?
How many hours of sunshine does Ystradgynlais have in December?
What is the month with the lowest UV index in Ystradgynlais?
How high is the UV index in December in Ystradgynlais?
Average temperature in December
Ystradgynlais, United Kingdom
- Average high temperature in December: 8.3°C
The warmest month (with the highest average high temperature) is July (18.2°C).
The months with the lowest average high temperature are January and February (7.3°C).
- Average low temperature in December: 5.2°C
The month with the highest average low temperature is August (12.9°C).
The coldest month (with the lowest average low temperature) is February (3.8°C).
Average pressure in December
Ystradgynlais, United Kingdom
- Average pressure in December: 1013.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).
Average wind speed in December
Ystradgynlais, United Kingdom
- Average wind speed in December: 22.4km/h
The windiest month (with the highest average wind speed) is December (22.4km/h).
The calmest month (with the lowest average wind speed) is June (14.9km/h).
Average humidity in December
Ystradgynlais, United Kingdom
- Average humidity in December: 87%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is April (81%).
Average rainfall in December
Ystradgynlais, United Kingdom
- Average rainfall in December: 66mm
The wettest months (with the highest rainfall) are November and December (66mm).
The driest month (with the least rainfall) is May (31mm).
Average rainfall days in December
Ystradgynlais, United Kingdom
- Average rainfall days in December: 16.9 days
The month with the highest number of rainy days is November (17 days).
The month with the least rainy days is September (12.6 days).
Average snowfall in December
Ystradgynlais, United Kingdom
- Average snowfall in December: 9mm
The month with the highest snowfall is January (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Ystradgynlais, United Kingdom
- Average snowfall days in December: 1.1 days
The month with the highest number of snowfall days is January (2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Ystradgynlais, United Kingdom
- Average daylight in December: 7h and 5min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is May (Average sunshine: 8h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Ystradgynlais, United Kingdom
- Average sunshine days in December: 11.1 days
The month with the most sunshine days is September (14.4 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in December
Ystradgynlais, United Kingdom
- Average UV index in December: 2
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Ystradgynlais, United Kingdom
- Average cloud cover in December: 63
The month with the most cloud cover is December (Cloud cover 63).
The months with the least cloud cover are April and May (Cloud cover 47).
Average visibility in December
Ystradgynlais, United Kingdom
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
